How long _______ your brother _______ the hometown—Since he was only ten years old.

It never occurred to me _____you could succeed in persuading him to change his mind.[ ]

We used to work in the same office and we ________ have coffee together.

Einstein’s Theory of Relativity is so ________that most of us can not understand it.

His uncle is a worker and has been working in the factory for more than ten years. _____.